to be martin luther king, the holiday that celebrates his legacy. the senate historian gave a historical perspective. health varioust variou presidents treat the de. >>-- the various ways presidents treat the day. >> the constitution rights of the oath of office. -- rights out the oath of office. -- writes out the oath of office. most presidents say, "so help me god." there was a tradition, a folklore that developed that washington said, "so help me god." we as historians have been looking for any possible resource. we're not sure about this. one of the accounts was given to us by washington irving. he gave his ramparts that washington said, -- rememberance that washington said, "so help me god." most presidents in the 19th century did not repeat the oath of office. they just said, " i do," at the end of the oath. ,tarting about the 1880's presidents began to say, "so help me god." the chief justice who swears the men inevitably says -- them in inevitably says, "so help me god." it has become tradition. tradition is much more important than even constitutional structure in this process.